臺灣博碩士論文加值系統

由於熱輻射方程式包含了溫度四次方的計算，使得這個方程式在計算上變得非常棘手。 因此，在一般工程應用上，若絕熱表面與外界環境之間的溫差非常小，則忽略熱輻射因素。在本研究中，我們透過模擬某些實際情況來研究絕熱球形容器於考慮和忽略熱輻射效應下，兩者之熱傳特性的差異程度。結果發現即使處於外表面與周遭環境的溫差很小 (如1℃) 的情況，熱輻射效應在低數值的對流熱傳係數(例如空氣)與較高的表面放射率的狀況下是不容忽略的。在大多數情況下，若忽略了熱輻射效應將伴生很大的誤差，從而影響了設計品質。此外也證明了當應用較小的表面放射率時能夠顯著地提升絕熱效果。

Heat radiation equation contains 4th exponential order of temperature which makes heat equation calculation become very troublesome. Thus, in conventional application, the heat radiation effect was ignored in situations of small temperature difference between insulated surfaces and surrounding. In this investigation, the differences heat transfer characteristics of an insulated spherical container between considering and neglecting the influence of heat radiation is studied by the simulations in some practical situations. It is found that even in situations of very low temperature-difference between outer surface and surrounding (such as 1℃), the heat radiation effect can’t be ignored in situations of lower ambient convection heat coefficients and greater surface emissivities. In most situations, ignoring the heat radiation will generate quite a big errors (especially in surface temperature) and affect the design quality. It is also proved that using smaller surface emissivity can greatly improve the performance of insulation.

中文摘要--------------------------------------------------i
英文摘要-------------------------------------------------ii
誌謝-----------------------------------------------------iv
目錄------------------------------------------------------v
圖目錄-------------------------------------------------- vi
表目錄----------------------------------------------------x
符號說明------------------------------------------------ xi

一、緒論
1.1簡介---------------------------------------------------1
二、研究方法
2.1不考慮熱輻射效應的情況-----------------------------3
2.2考慮熱輻射效應的情況-------------------------------4
三、數值結果- --------------------------------------------9
四、結果與討論-------------------------------------------11
五、結論-------------------------------------------------15
六、附錄-------------------------------------------------17
七、參考文獻---------------------------------------------41
自傳- ---------------------------------------------------46

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